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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
-5.5 = 11/a // - 11/a
-(11/a)-5.5 = 0
-11*a^-1-5.5 = 0
-11*a^-1 = 5.5 // : -11
a^-1 = -0.5
-1 < 0
1/(a^1) = -0.5 // * a^1
1 = -0.5*a^1 // : -0.5
-2 = a^1
a = -2
a = -2
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